CVE-2025-5592
📋 TL;DR
A critical buffer overflow vulnerability in FreeFloat FTP Server 1.0's PASSIVE command handler allows remote attackers to execute arbitrary code or crash the service. This affects all deployments of FreeFloat FTP Server 1.0 with the vulnerable component enabled. Attackers can exploit this without authentication over the network.
💻 Affected Systems
- FreeFloat FTP Server
📦 What is this software?
Ftp Server by Freefloat
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Service crash causing denial of service, with potential for RCE if exploit is weaponized
If Mitigated
Denial of service only if exploit attempts are blocked by network controls
🎯 Exploit Status
Public exploit code is available, making exploitation straightforward for attackers
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. Consider migrating to a maintained FTP server solution.
🔧 Temporary Workarounds
Disable PASSIVE mode
windowsConfigure FreeFloat FTP Server to disable PASSIVE mode, forcing clients to use ACTIVE mode only
Edit server configuration to set passive mode = false
Network segmentation
windowsRestrict FTP server access to trusted networks only using firewall rules
Windows Firewall: New Inbound Rule blocking port 21 from untrusted networks
🧯 If You Can't Patch
- Replace FreeFloat FTP Server with a maintained alternative like FileZilla Server, vsftpd, or ProFTPD
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if FreeFloat FTP Server 1.0 is installed and running on port 21Check Version:
Check program files directory for FreeFloat FTP Server and version informationVerify Fix Applied:
Verify PASSIVE mode is disabled in configuration or server has been replaced📡 Detection & Monitoring
Log Indicators:
- Multiple failed PASSIVE command attempts
- Unusual buffer overflow errors in server logs
- Server crash/restart events
Network Indicators:
- Malformed PASSIVE commands with excessive data
- Exploit pattern matching from public PoC
SIEM Query:
source="ftp_server.log" AND ("PASSIVE" AND "overflow" OR "crash")🔗 References
- https://fitoxs.com/exploit/exploit-d28993dd71bcf3fbc63ff58db41e5f10a3ff7932e72d9e25c556cf18921a98e3.txt
- https://vuldb.com/?ctiid.311078
- https://vuldb.com/?id.311078
- https://vuldb.com/?submit.586990
- https://fitoxs.com/exploit/exploit-d28993dd71bcf3fbc63ff58db41e5f10a3ff7932e72d9e25c556cf18921a98e3.txt
